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The effect of low temperature on lithium-ion batteries

Lithium ion batteries, as green and environmentally friendly energy sources, have been widely used in various fields, but their poor low-temperature performance limits their application in special fields such as aerospace, and specialty industries. Generally, when the temperature drops to -10 ℃, the discharge capacity and working voltage of lithium-ion batteries will decrease.

As is well known, temperature has a very important impact on the performance of lithium-ion batteries. When the temperature is too low, due to the increase in electrolyte viscosity, the SEI film impedance increases, and the dynamic performance of the graphite negative electrode deteriorates. This can lead to an increase in electrochemical polarization of the battery, greatly reducing its discharge capacity. For example, an electric vehicle that can travel 105 miles at 23.9 ℃ can only travel about 60 miles at -6.7 ℃.

At the same time, low-temperature charging is very dangerous, which can lead to the emergence of lithium dendrites and cause serious safety issues.

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